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在android应用程序中,我想创建一个应用程序,该应用程序具有一个名为CleanCache的按钮,并在代码中列出所有应用程序缓存并使用Toast消息清除缓存清除。我看着不同的问题和答案,但没有发现任何有趣的事情。我已经实施,但它包含错误。在android程序清除应用程序的缓存不适用于图像
这里是我的MainActivity.java文件:
package com.example.ahsankhan.cache;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import java.io.File;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButton();
}
public void addListenerOnButton() {
//Select a specific button to bundle it with the action you want
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
@Override
public void onCreate(Bundle *) {
super.onCreate(*);
setContentView(R.layout.activity_main);
}
@Override
protected void onStop(){
super.onStop();
}
//Fires after the OnStop() state
@Override
protected void onDestroy() {
super.onDestroy();
try {
trimCache(this);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void trimCache(Context context) {
try {
File dir = context.getCacheDir();
if (dir != null && dir.isDirectory()) {
deleteDir(dir);
}
} catch (Exception e) {
// TODO: handle exception
}
}
public static boolean deleteDir(File dir) {
if (dir != null && dir.isDirectory()) {
String[] children = dir.list();
for (int i = 0; i < children.length; i++) {
boolean success = deleteDir(new File(dir, children[i]));
if (!success) {
return false;
}
}
}
// The directory is now empty so delete it
return dir.delete();
}
}
});
}
}
activity_main.xml中文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button - Go to mkyong.com" />
</LinearLayout>
AndroidManifest.xml文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.ahsankhan.cache" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
你会得到什么错误? *甚至是一个有效的变量名称? –
[Android:Clear Cache of All Apps?]可能的重复?(http://stackoverflow.com/questions/14507092/android-clear-cache-of-all-apps) – EvenLisle
@kevin工作人员不能执行变量名称,未知表达式第36行中的类型错误,37,42,43,48,49 – Andrew